If it makes you feel any better, our saab is all electronic release on the rear hatch, and it has never once failed. However, if you're worried, you could always make a small hole, then route a cable through so that you can pull the emergency trunk release handle from outside the car in the event it does fail. This of course assumes you have one, some hatchbacks do not because they don't have a fully enclosed trunk.
But basically I would not worry too much about the trunk release failing. Worry more about, well, just everything else about it being a VW.
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